AG Monitoring Relays 3UG Monitoring Relays for … Relays Siemens LV 1 T · 2007 7/61 7 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring Overview Solid-state

Monitoring Relays

7/61Siemens LV 1 T · 2007

7

3UG Monitoring Relays for Electrical and Additional Measurements

Line monitoring

■ Overview

Solid-state line monitoring relays provide maximum protection for mobile machines and plants or for unstable networks. Network and voltage faults can be detected early and rectified before far greater damage ensues.

Depending on the version, the relays monitor phase sequence, phase failure with and without N conductor monitoring, phase unbalance, undervoltage or overvoltage. With the 3UG46 17 or 3UG46 18 relay, a wrong direction of rotation can also be corrected automatically.

■ Function

3UG45 11 monitoring relays

The 3UG45 11 phase sequenced relay monitors the phase sequence in a three-phase network. No adjustments are required for operation. The device has an internal power supply and works using the closed-circuit principle. If the phase sequence at the terminals L1-L2-L3 is correct, the output relay picks up after the delay time has elapsed and the LED is lit. If the phase sequence is wrong, the output relay remains in its rest position.

Note:When one phase fails, connected loads (motor windings, lamps, transformers, coils, etc.) create a feedback voltage at the terminal of the failed phase due to the network coupling. Because the 3UG45 11 relays are not resistant to voltage feedback, such a phase failure is not detected. Should this be required, then the 3UG45 12 monitoring relay must be used.

Correct phase sequence

Wrong phase sequence


The 3UG45 12 line monitoring relay monitors three-phase net-works with regard to phase sequence, phase failure and phase unbalance of 10 %. Thanks to a special measuring method, a phase failure is reliably detected in spite of the wide voltage range from 160 to 690 V AC and feedback through the load of up to 90 %. The device has an internal power supply and works using the closed-circuit principle. No adjustments are required. When the mains voltage is switched on, the green LED is lit. If the phase sequence at the terminals L1-L2-L3 is correct, the output relay picks up. If the phase sequence is wrong, the red LED flashes and the output relay remains in its rest position. If a phase fails, the red LED is permanently lit and the output relay drops.

Note: The red LED is a fault diagnostic indicator and does not show the current relay status. The 3UG45 12 monitoring relay is suitable for line frequencies of 50/60 Hz.

Phase failure


NS

B0

_0

15

65

11/14

L1-L2-L3

11/12

21/24

21/22

ON

NS

B0

_0

15

66

11/14

L3-L2-L1

11/12

21/24

21/22

OFF

NS

B0

_0

15

67

11/14

L1-L2-L3L2-L3L1-L2-L3

11/12

21/24

21/22

LED rd

OFF OFFON

Phase loss

NS

B0

_0

15

68

11/14

11/12

L3-L2-L1

21/24

21/22

LED rd

FLASH

Phase sequence

OFFOFF

© Siemens AG 2007

7Monitoring Relays


Line monitoring

7/62 Siemens LV 1 T · 2007


The 3UG45 13 line monitoring relay monitors three-phase net-works with regard to phase sequence, phase failure, phase un-balance of 20 % and undervoltage. The device has an internal power supply and works using the closed-circuit principle. The hysteresis is 5 %. The integrated response delay time is adjust-able from 0 to 20 s and responds to undervoltage. If the direction is incorrect, the device switches off immediately. Thanks to a special measuring method, a phase failure is reliably detected in spite of the wide voltage range from 160 to 690 V AC and feedback through the load of up to 80 %. When the mains volt-age is switched on, the green LED is lit. If the phase sequence at the terminals L1-L2-L3 is correct, the output relay picks up. If the phase sequence is wrong, the red LED flashes and the out-put relay remains in its rest position. If a phase fails, the red LED is permanently lit and the output relay drops.

Note: The red LED is a fault diagnostic indicator and does not show the current relay status. The 3UG45 13 monitoring relay is suitable for line frequencies of 50/60 Hz.

Phase failure and undervoltage



The 3UG46 14 line monitoring relay has a wide voltage range and an internal power supply. The device is equipped with a dis-play and is parameterized using three buttons. It monitors three-phase networks with regard to phase unbalance from 5 to 20 %, phase failure, undervoltage and phase sequence. The hystere-sis is adjustable from 1 to 20 V. In addition the device has a response delay and ON-delay from 0 to 20 s in each case. The integrated response delay time responds to phase unbal-ance and undervoltage. If the direction is incorrect, the device switches off immediately. Thanks to a special measuring method, a phase failure is reliably detected in spite of the wide voltage range from 160 to 690 V AC and feedback up to 80 % through the load.

The 3UG46 14 monitoring relay can be operated on the basis of either the open-circuit or closed-circuit principle and with manual or auto RESET.

With the closed-circuit principle selected


Phase failure

Undervoltage

Unbalance

NSB0_01569

11/14

-20%

L1-L2-L3L2-L3L1-L2-L3

n3~U5%

11/12

21/24

21/22

LED rd

Delay

OFFOFF OFF

Hysteresis

ON

Phase loss

ON

NS

B0_01570

11/14

L3-L2-L1

11/12

21/24

21/22

LED rd

FLASH

Phase sequence

OFFOFF

NS

B0_01571

11/14

L3-L2-L1

11/12

21/24

21/22

NS

B0_01576

11/14

11/12

21/24

21/22

L1-L2-L3L2-L3L1-L2-L3

NS

B0_01577

<

21/24

21/22

11/14

11/12

x-yHysteresis

DelayonDelay

NS

B0_01578

> Asy

0%

21/24

21/22

11/14

11/12

Hysteresis

2%

DelayonDelay

© Siemens AG 2007

Monitoring Relays


7


Line monitoring

3UG46 15/3UG46 16 monitoring relays

The 3UG46 15/3UG46 16 line monitoring relay has a wide volt-age range and an internal power supply. The device is equipped with a display and is parameterized using three buttons. The 3UG46 15 device monitors three-phase networks with regard to phase failure, undervoltage, overvoltage and phase sequence. The 3UG46 16 monitoring relay monitors the neutral conductor as well. The hysteresis is adjustable from 1 to 20 V. In addition the device has two separately adjustable delay times for overvoltage and undervoltage from 0 to 20 s in each case. If the direction is incorrect, the device switches off immediately. Thanks to a special measuring method, a phase failure is reliably detected in spite of the wide voltage range from 160 to 690 V AC and feedback through the load of up to 80 %.

The 3UG46 15/ 3UG46 16 monitoring relay can be operated on the basis of either the open-circuit or closed-circuit principle and with manual or auto RESET.



Phase failure

Undervoltage

Overvoltage


The 3UG46 17/ 3UG46 18 line monitoring relay has an internal power supply and can automatically correct a wrong direction of rotation. Thanks to a special measuring method, a phase failure is reliably detected in spite of the wide voltage range from160 to 690 V AC and feedback through the load of up to 80 %. The device is equipped with a display and is parameterized us-ing three buttons. The 3UG46 17 line monitoring relay monitors three-phase networks with regard to phase sequence, phase failure, phase unbalance, undervoltage and overvoltage. The 3UG46 18 monitoring relay monitors the neutral conductor as well. The hysteresis is adjustable from 1 to 20 V. In addition the device has delay times from 0 to 20 s in each case for over-voltage, undervoltage, phase failure and phase unbalance. The 3UG46 17/ 3UG46 18 monitoring relay can be operated on the basis of either the open-circuit or closed-circuit principle and with manual or auto RESET. The one changeover contact is used for warning or disconnec-tion in the event of line faults (voltage, unbalance), the other re-sponds only to a wrong phase sequence. In conjunction with a contactor reversing assembly it is thus possible to change the direction automatically.


Phase failure

Undervoltage

Overvoltage

Unbalance

NS

B0_01571

11/14

L3-L2-L1

11/12

21/24

21/22

NS

B0_01572

11/14

11/12

21/24

21/22

L1-L2-L3

L1-L2-L3-N

L2-L3

L1-L2-L3

L1-L2-L3

L1-L2-L3-N

NS

B0_01573

<

21/24

21/22

11/14

11/12

x-yHysteresis

Delay

NS

B0_01574

>

x-y

21/24

21/22

11/14

11/12

Hysteresis

Delay

NS

B0

_0

15

87

11/14

50 ms

11/12

21/24

21/22

L1-L2-L3

L1-L2-L3-N

L2-L3

L1-L2-L3

L1-L2-L3

L1-L2-L3-N

NS

B0

_0

15

88

11/14

50 ms

11/12

21/24

21/22

<x-yHysteresis

Delay

NS

B0

_0

15

89

11/14

50 ms

11/12

21/24

21/22

>

x-yHysteresis

Delay

NS

B0

_0

15

90

11/14

50 ms

11/12

21/24

21/22

> Asy

0 %

Hysteresis

2 %

Delay

© Siemens AG 2007

7Monitoring Relays


Line monitoring

7/64 Siemens LV 1 T · 2007

■ Technical specifications

1) Note: This is a Class A product. In the household environment this device may cause radio interference. In this case the user must introduce suitable measures.

3UG45 11-..N20

3UG45 11-..P20

3UG45 11-..Q20

3UG45 12 3UG45 13 3UG46 14 3UG46 153UG46 163UG46 173UG46 18

General dataRated control supply voltage Us V 160 … 260 320 … 500 420 … 690 160 … 690

Rated frequency Hz 50/60

Rated power, typical• At 230 V AC W/VA 2/4 -- -- 2/2.5• At 400 V AC W/VA -- 2/8 -- 2/3.5• At 460 V AC W/VA -- -- 2/8 2/4

Width mm 22.5

RESET Auto-RESET Automatic/manual

Principle of operation Closed-circuit Closed-circuit, open-circuit (3UG46 17/3UG46 18: closed-circuit)

Availability time after application of Us ms 200 1000

Response time on reaching a switching threshold ms Max. 450

Adjustable tripping delay time s -- 0.1 ... 20

Adjustable ON-delay time s -- 0.1 … 20 --

Mains buffering time, min. ms 10 30

Rated insulation voltage UiDegree of pollution 3Overvoltage category III according to VDE 0110

V 690

Rated impulse withstand voltage kV 6

Permissible ambient temperature • During operation °C -25 … +60• During storage °C -40 … +85

EMC tests1) IEC 60947-1/ IEC 61000-6-2 / IEC 61000-6-4

Degree of protection• Enclosures IP40• Terminals IP20

Vibration resistance according to IEC 60068-2-6 Hz/mm 1-6/15; 6-500, 20 m/s2

Shock resistance according to IEC 60068 Part 2-27 g/ms 15/11

Conductor cross-section• Screw terminals M3 (standard screwdriver size 2 and Pozidriv 2)

- Solid mm2 1 x (0.5 ... 4) / 2 x (0.5 ... 2.5)- Finely stranded with end sleeve mm2 1 x (0.5 ... 2.5) / 2 x (0.5 ... 1.5)- AWG conductors, solid or stranded AWG 2 x (20 ... 14)- Tightening torque Nm 0.8 … 1.2

• Spring-loaded terminals- Solid mm2 2 x (0.25 ... 1.5)- Finely stranded, with end sleeves according to

DIN 46228mm2 2 x (0.25 ... 1.5)

- Finely stranded mm2 2 x (0.25 ... 1.5)- AWG conductors, solid or stranded AWG 2 x (24 ... 16)

Measuring circuitMeasuring range AC 50/60 Hz rms value V 160 ... 260 320 ... 500 420 ... 690 160 ... 690

Setting range V 200...690 160...690

Measuring accuracy % -- ±5

Repeat accuracy at constant parameters % -- ±1

Setting accuracy -- �10 % referred to set value

�1 V

Accuracy of digital display -- +/-1 digit

Deviations for temperature fluctuations %/°C -- ±0.1

Hysteresis for voltage V -- 5 % of set value

1 ... 20 V

Hysteresis for unbalance % -- 2 % of limit value

2 % of limit value for 3UG46 17/3UG46 18

Deviation for frequency fluctuation % -- ±1 %

© Siemens AG 2007

Monitoring Relays


7


Line monitoringk

■ Dimensional drawings

3UG45 11-..N20

3UG45 11-..P20

3UG45 11-..Q20

3UG45 12 3UG45 13 3UG46 14 3UG46 153UG46 163UG46 173UG46 18

Control circuitLoad capacity of the output relay• Thermal current limit Ith A 5

Rated operational current Ie at• AC-15/24 ... 400 V A 3• DC-13/24 V A 1• DC-13/125 V A 0.2• DC-13/250 V A 0.1

Minimum contact load at 17 V DC mA 5

Output relay with DIAZED fusegL/gG operational class

A 4

Electrical endurance AC-15 Million oper. cycles

0.1

Mechanical endurance Million oper. cycles

10

NSB0_01606

A B C74

86536

62 90

1522,5

62 110

1522,5

82

Type 3UG45 11-.A3UG45 12-.A

3UG45 11-.B3UG45 12-.B3UG45 133UG46 143UG46 153UG46 17

3UG46 163UG46 18

A B C

Removable terminals

Spring-loaded terminal

84 94 103

Screw terminal 83 92 102

© Siemens AG 2007

7Monitoring Relays


Line monitoring

7/66 Siemens LV 1 T · 2007

■ Schematics

Position of the connection terminals

3UG45 11-.A3UG45 12-.A

3UG45 11-.B3UG45 12-.B3UG45 133UG46 143UG46 153UG46 17

3UG46 163UG46 18

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�

�

� � �

3UG45 11-.A3UG45 12-.A

3UG45 11-.B3UG45 12-.B3UG45 133UG46 143UG46 153UG46 17

3UG46 163UG46 18

��

� �

� � � � �

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��

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�

© Siemens AG 2007

Monitoring Relays


7


Voltage monitoring

■ Overview

The relays monitor single-phase AC and DC voltages against the set threshold value for overshoot and undershoot. The products differ with regard to their power supply (internal or external).

■ Function


The 3UG46 33 voltage monitoring relay has an internal power supply and performs overshoot, undershoot or window monitor-ing of the voltage depending on how it is parameterized. The device is equipped with a display and is parameterized using three buttons.The operating and measuring range extends from 17 V to 275 V AC/DC. The threshold values for overshoot or undershoot can be freely configured within this range. If one of these thresh-old values is reached, the output relay responds according to the set principle of operation as soon as the tripping delay time has elapsed. This delay time UDel can be set from 0.1 to 20 s like the ON-delay time onDel.

The hysteresis is adjustable from 0.1 to 150 V. The device can be operated on the basis of either the open-circuit or closed-circuit principle and with manual or auto RESET. One output changeover contact is available as signaling contact.


Overvoltage

Undervoltage

Window monitoring

NS

B0

_0

15

84

11/14

11/12

= 0

A1-A2 = >

Hysteresis

DelayonDelay

NS

B0

_0

15

85

11/14

11/12

= 0

A1-A2 = <

Hysteresis

DelayonDelay

A1-A2 =

NS

B0

_0

15

86

>

11/14

11/12

= 0

<

Hysteresis

Hysteresis

DelayonDelay

Delay =

Delay

Delay

© Siemens AG 2007

7Monitoring Relays


Voltage monitoring

7/68 Siemens LV 1 T · 2007


The 3UG46 31/3UG46 32 voltage monitoring relay is supplied with an auxiliary voltage of 24 V AC/DC or 24 to 240 V AC/DC and performs overshoot, undershoot or window monitoring of the voltage depending on how it is parameterized. The device is equipped with a display and is parameterized using three buttons.The measuring range extends from 0.1 V to 60 V or 10 to 600 V AC/DC. The threshold values for overshoot or undershoot can be freely configured within this range. If one of these threshold values is reached, the output relay responds according to the set principle of operation as soon as the delay time has elapsed. This delay time UDel can be set from 0.1 to 20 s. The hysteresis is adjustable from 0.1 to 30 V or 0.1 to 300 V. The device can be operated on the basis of either the open-circuit or closed-circuit principle and with manual or auto RESET. One output changeover contact is available as signaling contact.


Overvoltage

Undervoltage

Window monitoring

NS

B0

_0

15

81

>

11/14

11/12

= 0

A1-A2

Hysteresis

Delay

NS

B0

_0

15

82

<

11/14

11/12

= 0

A1-A2

Hysteresis

Delay

NS

B0

_0

15

83

a

>

11/14

11/12

A1-A2

<

Hysteresis

Hysteresis

Delay Delay

Delay = Delay

© Siemens AG 2007

Monitoring Relays


7


Voltage monitoring



3UG46 31-.AA

3UG46 31-.AW

3UG46 32-.AA

3UG46 32-.AW

3UG46 33

General dataRated control supply voltage Us V 24 AC/DC 24 ... 240

AC/DC24 AC/DC 24 ... 240

AC/DC17 ... 275 AC/DC

Rated frequency for AC Hz 50/60 40 ... 500

Operating range V 20.4 ... 27.6 20.4 ... 264 20.4 ... 27.6 20.4 ... 264 17...275

Rated power in W/VA VA 2/4

Width mm 22.5

RESET Automatic / manual

Availability time after application of Us ms 1000

Response time on reaching a switching threshold ms 450

Adjustable tripping delay time s 0.1 … 20

Adjustable ON-delay time s -- 0.1 ... 20

Mains buffering time, min. ms 10


V 690

Rated impulse withstand voltage Uimp kV 6

Safe isolation according to EN 60947-1 V 300


EMC tests1) IEC 60947-1 / IEC 61000-6-2 / IEC 61000-6-4


Vibration resistance according to IEC 60068-2-6 Hz/mm 1-6/15; 6-500, 20 m/s2




• Spring-loaded terminals- Solid mm2 2 x (0.25 ... 1.5)- Finely stranded, with end sleeves according to DIN 46228 mm2 2 x (0.25 ... 1.5)- Finely stranded mm2 2 x (0.25 ... 1.5)- AWG conductors, solid or stranded AWG 2 x (24 ... 16)

Measuring circuitPermissible measuring range single-phase AC/DC voltage V 0.1 … 68 10 … 650 17 … 275

Setting range single-phase voltage V 0.1 ... 60 10 ... 600 17 ... 275

Measuring frequency Hz 40 ... 500 40 ... 500

Measuring accuracy % 5

Repeat accuracy at constant parameters % 1

Accuracy of digital display �1 digit

Deviations for temperature fluctuations %/°C �0.1

Hysteresis for single-phase voltage V 0.1 ... 30 0.1 ... 300 0.1 ... 150Control circuitLoad capacity of the output relay• Thermal current limit Ith A 5




A 4

Electrical endurance AC15 Million oper. cycles

0.1

Endurance with contactor relay Million oper. cycles

10

© Siemens AG 2007

7Monitoring Relays


Voltage monitoring

7/70 Siemens LV 1 T · 2007


1) For standard mounting rail according to EN 60715.

■ Schematics


NSB0_01699A B74

865

62

110

15

22,5

72

1)

Type 3UG46 313UG46 323UG46 33

3UG46 313UG46 323UG46 33

A B

Removable terminals

Spring-loaded terminal 84 94

Screw terminal 83 92

3UG46 31-.AA303UG46 32-.AA30

3UG46 31-.AW30 3UG46 32-.AW30

3UG46 33

NSB0_01532b

12

11

14

A1(+)

U

IN(+)

A2(–) M(–)

< U >

AC/DC Load

NSB0_01614a

12

11

14

A1(+)

U

IN(+)

A2(–) M(–)

< U >

AC/DC Load

NSB0_01533b

12

11

14

A1(+)

A2(–)

< U >

AC/DC

3UG46 313UG46 32

3UG46 33

��

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� �

� � �

� � � � �

��

� �

� �

� � � � �

© Siemens AG 2007

Monitoring Relays


7


Current monitoring

■ Overview

The relays monitor single-phase currents for overshoot and undershoot against the set threshold. They differ with regard to their measuring ranges and voltage types.

■ Function


The 3UG46 21/3UG46 22 current monitoring relay is supplied with an auxiliary voltage of 24 V AC/DC or 24 to 240 V AC/DC and performs overshoot, undershoot or window monitoring of the current depending on how it is parameterized. The device is equipped with a display and is parameterized using three buttons.

The measuring range extends from 3 to 500 mA or 0.05 to 10 A. The rms value of the current is measured. The threshold values for overshoot or undershoot can be freely configured within this range. If one of these threshold values is reached, the output relay responds according to the set principle of operation as soon as the tripping delay time IDel has elapsed. This time and the ON-delay time onDel are adjustable from 0.1 to 20 s.

The hysteresis is adjustable from 0.1 to 250 mA or 0.01 to 5 A. The device can be operated on the basis of either the open-circuit or closed-circuit principle and with manual or auto RESET. One output changeover contact is available as signaling contact.


Current overshoot

Current undershoot

Window monitoring

NS

B0

_0

15

79

= 0

11/14

A1-A2

11/12

>

Hysteresis

DelayonDelay

NS

B0

_0

15

80

= 0

11/14

A1-A2

11/12

<

Hysteresis

DelayonDelay

NS

B0

_0

16

26

>

11/14

11/12

= 0

A1-A2

<

Hysteresis

Hysteresis

DelayDelay

DelayDelay =

onDelay

© Siemens AG 2007

7Monitoring Relays


Current monitoring

7/72 Siemens LV 1 T · 2007



2) With safe isolation.3) With easy isolation.

3UG46 21-.AA 3UG46 21-.AW 3UG46 22-.AA 3UG46 22-.AWGeneral dataRated control supply voltage Us V 24 24 … 240 24 24 … 240


Operating range V 20.4 ... 26.4 20.4 ... 264 20.4 ... 26.4 20.4 ... 264

Rated power W/VA 2/4

Width mm 22.5

RESET Automatic/ manual



Adjustable tripping delay time s 0.1 … 20

Adjustable ON-delay time s 0.1 … 20


Rated insulation voltage UiDegree of pollution 3; overvoltage category III according to VDE 0110

V 690

Rated impulse withstand voltage Uimp kV 6

Safe isolation according to EN 60947-1 V 300

Permissible ambient temperature• During operation °C -25 … +60• During storage °C -40 … +85

EMC tests1) IEC 60947-1/ IEC 61000-6-2 / IEC 61000-6-4

Degree of protection• Enclosure IP40• Terminals IP20

Vibration resistance according to IEC 60068-2-6 Hz/mm 1-6/15; 6-500.20 m/s2





Measuring circuitMeasuring range for single-phase AC/DC current A 0.003 … 0.6 0.05 … 15

Setting range for single-phase current A 0.003 ... 0.5 0.05 ... 10

Load supply voltage V 24 Max. 3002)

Max. 5003)24 Max. 3002)

Max. 5003)



Accuracy of digital display �1 digit

Deviations for temperature fluctuations %/°C �0.1

Hysteresis for single-phase current 0.1 ... 250 mA 0.01 ... 5 A

Permissible overcurrent, continuous A 0.6 15

Permissible overcurrent, < 1 s A 5 50

Protection against destruction, DIAZED gL/gG A 2 16

Measuring circuit internal resistance, shunt m� 500 5Control circuitLoad capacity of the output relay• Thermal current limit Ith A 5



Output relay with DIAZED fuse gL/gG A 4

Electrical endurance AC15 Million oper. cycles

0.1

Endurance with contactor relay Million oper. cycles

10

© Siemens AG 2007

Monitoring Relays


7


Current monitoring



■ Schematics


Wiring diagram for 24 V AC/DC (only 3UG46 2.-.AA30)

From the following circuit diagrams it is clear that loads in measuring circuits have to be in the current flow upstream from the monitoring relay. Otherwise the monitoring relay could be destroyed and the short-circuit current could cause damage to the plant.

Configuring note:

A2 and M are electrically connected internally!

For applications in which the load to be monitored and the monitoring relay are supplied from the same power supply, there is no need for connection A2!

The load current must always flow through M or the monitoring relay may be destroyed!

NSB0_01699

A B74

865

62

110

15

22,5

72

1)

Type 3UG46 213UG46 22

A B

Removable terminals

Spring-loaded terminal 84 94


3UG46 21-.AA303UG46 22-.AA30Operation with separate control circuit and load circuit

Operation with joint control circuit and load circuit

3UG46 21-.AW30 3UG46 22-.AW301-phase operation 3-phase operation

3UG46 213UG46 22

< >

11

14

NS

B0

_0

15

34

b

12

A2 M

A1 IN

24 V AC/DC

MLoad

ULoad

Load

< >

11

14

NS

B0

_0

17

08

12

A2 M

A1 IN

24 V AC/DC

optional

Load

NS

B0

_0

15

35

b

11

14

M

12

A1

A2

< >

IN

AC/DC

MLoad

Load

ULoad

NS

B0

_0

17

07

< >

A1

IN

A2

M

L3

L2

L1

AC/DC

11

14

12

Load

��

� �

� �

� � �

� � � � �

NS

B0

_0

11

99

e

A1

A2 M

IN

< >

o.k.

24 V AC/DC

MLoad

ULoad

Load

o.k.

NS

B0

_0

12

00

e

A2

M

L1

L2

L3

IN

A1

< >

24 V AC/DC

Load

o.k.

< >

A2

M

A1

IN

NSB0_01197e

24 V AC/DC

Load

NS

B0

_0

11

98

e

o.k.

A2

M

L1

L2

L3

IN

A1

< >

3UG3

24 V AC/DC

Load

© Siemens AG 2007

7Monitoring Relays


Power factor and active current monitoring

7/74 Siemens LV 1 T · 2007

■ Overview

The 3UG46 41 power factor and active current monitoring device enables the load monitoring of motors.

Whereas power factor monitoring is used above all for monitor-ing no-load operation, the active current monitoring option can be used to observe and evaluate the load factor over the entire torque range.

■ Function


The 3UG46 41 monitoring relay is self-powered and serves the single-phase monitoring of the power factor or performs overshoot, undershoot or window monitoring of the active current depending on how it is parameterized.

The load to be monitored is connected in front of the IN terminal. The load current flows over the IN and Ly/N terminals. The setting range for the power factor is 0.1 ... 0.99 and for the active current Ires 0.2 ... 10 A.

If the supply voltage is switched on and no load current is flowing, the display indicates I < 0.2 and a symbol for overshoot, undershoot or window monitoring.

If the motor is now switched on and the current exceeds 0.2 A, the set ON-delay time begins. During this time, an undershoot-ing or overshooting of the set limit values will not led to a relay response of the changeover contact.

If the operational flowing active current and/or the power factor value falls below or exceeds the respective set threshold value, the spike delay begins. When this time has expired, the relay changes its switch position. The relevant measured variables for overshooting and undershooting in the display flashes.

The relay operates either according to the open-circuit or closed-circuit principle.

If the device is set to Auto-RESET (Memory = No), depending on the set principle of operation, the switching relay returns to its initial state and the flashing ends when the hysteresis threshold is reached.

If manual reset is selected in the menu (Memory = Yes), the switching relay remains in its current switching state and the current measured value and the symbol for undershooting and overshooting continues to flash, even when the measured variable reaches a permissible value again. This stored fault status can be reset by pressing the UP▲ and DOWN▼ key simultaneously for 2 seconds, or by switching the supply voltage off and back on again.


Display outside the measuring range limits

Overshooting of active currentN

SB

0_

01

65

8

21/24

21/22

11/14

11/12

< 0,2 A

Lx-Ly/N

= 0,2 A

= 0

onDelay onDelay

NS

B0

_0

16

59

21/24

21/22

11/14

11/12

> res

= 0

res

DelayonDelay

Hysteresis

© Siemens AG 2007

Monitoring Relays


7



Undershooting of active current

Window monitoring of active current

Overshooting of power factor

Undershooting of power factor

Window monitoring of power factor

Legend

p.f.: power factorcos �: power factor

NS

B0

_0

16

60

21/24

21/22

11/14

11/12

< res

= 0

res

DelayonDelay

Hysteresis

NS

B0

_0

16

61

21/24

21/22

11/14

11/12

< res

= 0

> res

res

res

DelayonDelay Delay

Hysteresis

Hysteresis

NS

B0

_0

16

62

21/24

21/22

11/14

11/12

> cos

cos = 0

cos

p.f.

DelayonDelay

Hysteresis 0,10

cos = 0

NS

B0

_0

16

63

21/24

21/22

11/14

11/12

< cos

cos

p.f.

Hysteresis 0,10

DelayonDelay

cos = 0

NS

B0

_0

16

64

21/24

21/22

11/14

11/12

> cos < cos

cos

cos

p.f.

Hysteresis

0,10

DelayonDelay Delay

© Siemens AG 2007

7Monitoring Relays



7/76 Siemens LV 1 T · 2007



Type 3UG46 41General dataRated control supply voltage Us V 90 … 690


Rated power, typical• At 200 V AC VA 2.0• At 400 V AC VA 2.7• At 460 V AC VA 3.1

Width mm 22.5

RESET Automatic / manual

Principle of operation Closed-circuit principle, open-circuit principle



Adjustable tripping delay time s 0.1 ... 20

Adjustable ON-delay time s 0 ... 99



V 690

Rated impulse withstand voltage kV 6


EMC tests1) IEC 60947-1 / IEC 61000-6-2 / IEC 61000-6-4


Vibration resistance according to IEC 60068-2-6 Hz/mm 5 ... 25/0.75





Measuring circuitMeasurable active current Ires A 0.2 ... 10

Max. permissible load current A 10

Peak current < 1 s A 50

Adjustable response value Phase displacement angle

0.1 ... 0.99

DIAZED protection, gL/gG operational class A 16



Accuracy of digital display ± 1 digit

Deviations for temperature fluctuations %/°C ± 0.1

Hysteresis Phase angle 0.10

Hysteresis Active current monitoring A 0.1 ... 2.0

© Siemens AG 2007

Monitoring Relays


7





Type 3UG46 41Control circuitNumber of CO contacts for auxiliary contacts 2

Load capacity of the output relay• Thermal current Ith A 5

Rated operational current Ie at• AC-15/230 V A 3• DC-13/24 V A 1• DC-13/110 V A 0.2• DC-13/230 V A 0.1



A 4

Electrical endurance AC-15 Million oper. cycles

0.1

Mechanical endurance Million oper. cycles

10

NSB0_01699

A B74

865

62

110

15

22,5

72

1)

Type 3UG46 41

A B

Removable terminals

Spring-loaded terminals 84 94


© Siemens AG 2007

7Monitoring Relays



7/78 Siemens LV 1 T · 2007

■ Schematics


1-phase motors 3-phase motors 3-phase motors with transformers for currents > 10 A

M1~

Lx IN

12

14

22

24

N/L

L/N

21

Ly/N

11

3UG46 41

cos / r

cos / r

NSB0_01654b

Lx IN

12

14

22

24

Ln

Ln

Ln

n = 1,2,3

21

M3~

11

Ly/N

3UG46 41

cos / r

cos / r

NSB0_01655b

Lx IN

12

14

22

24

21

M3~

Ly/N

11

3UG46 41

NSB0_01656b

cos / r

cos / r

Ln

Ln

Ln

n = 1,2,3

3UG46 41

NS

B0

_0

16

57

Lx

12 14

IN

22 21 24

11

Ly/N

© Siemens AG 2007

Monitoring Relays


7

3UG Monitoring Relays for Electrical and Additional MeasurementsInsulation monitoring

for ungrounded AC networks

■ Overview

Relay for monitoring the insulation resistance between the ungrounded single or three-phase AC supply and a protective conductor• Measuring principle with superimposed DC voltage• Two selectable measuring ranges of 1 ... 110 k�• Stepless setting within the measuring range• Selectable:

- Auto reset function with fixed hysteresis or- Storage of the tripping operation

• Test function with test button and terminal connections on the front

• Switching output: 1 CO contact• Insulation fault indication with a red LED• Supply voltage indication with a green LED• Electro-magnetically compatible according to EN 50081 and

EN 61000-6-2.

■ Function

The monitoring relay measures the insulation resistance between the ungrounded AC supply and an associated protective conductor.

A superposed DC measuring voltage is used to perform the measurement.

The monitoring relay is divided into two ranges for an insulation resistance range from 1 ... 100 k�. A range switch on the front can be used to switch over between a 1 ... 11 k� range and a 10 ... 110 k� range. Within the selected range, the monitoring relay can be steplessly adapted to the respective insulation conditions.

If the insulation resistance undershoots the set response value, the output relay is excited and the red LED (fault indication) is lit.

If the insulation resistance exceeds 1.6 times (corresponding to 60 % hysteresis) the set response value, the output relay will return to the rest position.

Test functions

The "Test" button on the front can be used to simulate a ground fault. If the "Test" button is pressed for at least 300 ms, the output relay is energized and the fault LED lights up. An external test button can be connected to terminal Y1. The function is activated by closing (> 300 ms).

Fault storage and RESET

If terminals Y1 and Y2 are jumpered, the monitoring relay is set to fault storage mode. If the set insulation resistance is under-shot, the output relay is excited and remains tripped even after the insulation resistance rises above 1.6 times the set value again. Fault storage can be reset by briefly pressing the RESET button, briefly jumpering (< 300 ms) the Y1 and PE/ground terminals or by switching off and on the supply voltage.

Note:

The monitoring relay is designed for AC voltage systems. Series-connected rectifiers must be galvanically isolated from the measuring relay.

NSB0_01393a

= Supply voltage

A1-B2/A1-A2 for AC 115V/230V

A1-A2 for AC/DC 24 … 240V

= Remote connection-Save-Reset

= Button on the front Test/Reset

= Insulation resistance R of the network

= Normally open contact

1

2

3

4

5

1

2

3

4

5

tTest

tTest = > approx. 300 ms

A1/A2A1/B2

11/1411/12

Y1/Y2

Y1/PE

1,6 x Rvalue

R

Rvalue

© Siemens AG 2007

7Monitoring Relays

3UG Monitoring Relays for Electrical and Additional MeasurementsInsulation monitoringfor ungrounded AC networks

7/80 Siemens LV 1 T · 2007



■ Schematics

Connection diagram for networks up to 400 V AC

3UG30 81Control circuitOperating range of the control supply voltage -15 %... +10 %

Rated power 24 ... 240 V AC VA/W 8 / 2

110 ... 130 V AC VA 3

220 ... 240 V AC VA 3

Frequency of the rated control supply voltage Hz 50 ... 60Measuring circuit L/PE/ground• Response value k 1...110• Minimum internal resistance for AC k 100

• Minimum internal resistance for DC k 100

• DC measurement voltage V 30 DC

• Insulation voltage V 415 AC

• Reset/test function terminals (max. 10 m) Y1-Y2

• Delay time in case of response s 1

Output relay 1 CO contact, open-circuit principle

General data Rated insulation voltage Ui Between supply, measurement,

and output circuitV 400 according to IEC 60947-1

Overvoltage category According to IEC 664 III

Degree of pollution According to IEC 664 3

Impulse withstand voltage Uimp According to VDE 0435, Part 303 kV 4

Degree of protection According to EN 60529 IP50 enclosure, IP20 terminals

Shock resistance According to IEC 60068 Part 2-27 g/ms 10

Vibration resistance According to IEC 60068-2-6 Hz/mm 10-55/0.35

Permissible ambient temperature• During operation °C -25 ... 65• During storage °C -40 ... 85

Permissible mounting position Any

Conductor cross-section Solid mm2 2 x 0.75 ... 2.5

Finely stranded with end sleeve mm2 2 x 0.75 ... 2.5

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L1

L2

L3

A1

A2 B21)

N 230 VN 115 V

R

A1

A2 B21)

N 230 VN 115 V

L

PE Y2

Y1

11

1412

NS

B0_

0139

4a

A1-B2/A1-A2 for AC 115 V/230 VA1-A2 for AC/DC 24...240 V

) Only 3UG3081-1AK20.1

TestReset

3 x 230/400 V AC

PE

© Siemens AG 2007

Monitoring Relays


7

3UG Monitoring Relays for Electrical and Additional MeasurementsInsulation monitoring

for ungrounded DC networks

■ Overview

Relay for monitoring the insulation resistance between ungrounded pure DC networks and a protective conductor• Measuring principle for differential current measurement• Response value can be set continuously from 10 ... 110 k�• Selectable

- Auto reset function with hysteresis or- Storage of the tripping operation

• Front selector switch for open-circuit and closed-circuit principle for the output relay

• Test function with test buttons on the front for L+ and L-and over terminal connections

• Switching output: 1 CO contact• Insulation fault indicator for L+ and L- through two red LEDs• Supply voltage indication with a green LED• Electro-magnetically compatible according to EN 50081 and

EN 61000-6-2.

■ Function

The monitoring relay measures the insulation resistance between the positive and negative supply voltage in an ungrounded DC voltage network and a corresponding protective conductor.

The measurement is based on the DC residual current measurement principle. The response value can be adjusted steplessly in the range from 10 ... 110 k� and thus can be adapted to the corresponding conditions. If the insulation resistance falls below the set response value, the output relay triggers (depending on the setting of the open/closed-circuit principle selector switch) and a fault LED lights up.

A ground fault is evaluated separately for L+ and L- and indicated by means of a corresponding LED.

Note:

Due to the measurement principle, a symmetrical ground fault on terminals L+ and L- cannot be evaluated.

Test function

A ground fault can be simulated using the Test L+ and Test L- buttons on the front. If the test button is pressed for at least 1 s, the status of the output relay changes and the corresponding fault LED lights up.

An external test button can be connected to terminals Y1-Y3 for L+ and terminals Y4-Y3 for L-. The function is triggered by means of a NO contact.

Fault storage and RESET

If terminals Y2 and Y3 are linked, the monitoring relay is set to fault storage mode.

If the insulation resistance falls below the set value, the output relay triggers (depending on the setting of the open/closed circuit selector switch), and stays in this state even if the insu-lation resistance rises again above the hysteresis value (typical: 2 times the set value). This fault storage can be deleted by pressing and releasing the L+ RESET button, opening the Y2-Y3 connection or by switching off the supply voltage.

Open/closed-circuit principle selector switch

The principle of operation of the output relay can be adjusted by means of a selector switch on the front panel.

If the relay is to respond in the event of a fault (contact symbol open), the open-circuit principle must be selected. If the relay however is to trigger in the event of a fault (contact symbol closed), the closed-circuit principle must be selected.

Note:

The position of the selector switch has no effect upon the fault LEDs. The LEDs always light up if the insulation resistance on L+ or L– falls below the set value.

NSB0_01395a

= Supply voltage

= Button on front – Reset L+ and L-/Test L+

= Button on front – Test L – Test remote connection – Test L

= Test remote connection – Test L+

= Test remote connection – Store, reset

= Insulation resistance R of supply

set response value R

= Switch on front

Open-circuit/closed-circuit principle

= NO contact

Open- circuit/ closed circuit principle 11/14 11/12

2

1

3 4 5 6

7

8

2

1

3 4 5 6

7

8

A1/A2

Y3/Y4

Y1/Y3 Y2/Y3

L+/PE L-/PE

tTest > Is tTest = approx. 1 s

RHyst = typically 2 x Rx

R

Rvalue

RHyst

© Siemens AG 2007

7Monitoring Relays

3UG Monitoring Relays for Electrical and Additional MeasurementsInsulation monitoringfor ungrounded DC networks

7/82 Siemens LV 1 T · 2007



■ Circuit diagram

Connection diagram for 24...240 V DC

3UG30 82Control circuitOperating range of the control supply voltage -15 %... +10 %

Rated power 24 ... 240 V AC/DC VA/W 8 / 2

Frequency of the rated control supply voltage Hz 50 ... 60Measuring circuit• Response value k 10 ... 110

• Minimum internal resistance for DC k 57

• Measurement DC voltage V 24 ... 240

• Max. DC insulation voltage (L+/PE/ground, L-/PE/ground) V DC 300

• Reset/test function terminals (max. 10 m) Y1/Y3, Y4/Y3

• Delay time in case of response s 1

Output relay 1 changeover contact, open-circuit or closed-circuit principleGeneral data Rated insulation voltage Ui Insulation resistance

Between supply, measurement, and output circuit

V 400

Overvoltage category According to IEC 664 IIIDegree of pollution According to IEC 664 3

Impulse withstand voltage U.imp According to VDE 0435, Part 303 V 4000

Degree of protection According to EN 60529 IP50 enclosure, IP20 terminals

Shock resistance According to IEC 60068 Part 2-27 g/ms 10

Vibration resistance According to IEC 60068-2-6 Hz/mm 10-55/0.35

Permissible ambient temperature• During operation °C -25 ... + 65• During storage °C -40 ... + 85

Permissible mounting position Any

Conductor cross-section Solid mm2 2 x 0.75 ... 2.5

Finely stranded with end sleeve mm2 2 x 0.75 ... 2.5

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��

�

��

�

NS

B0_

0139

6

A1

A2

L+

PE

Y2

11

1412

Y1

Y4

Y3

Test L-

24...240 V AC/DC

R

24...240 V DC

L

L+

L-N

PE

L-

Test L+Reset

© Siemens AG 2007

Monitoring Relays


7


Level monitoring

■ Overview

The 3UG35 01 level monitoring relay is used together with the 2- or 3-pole sensors to monitor the levels of conductive liquids.

■ Function

The principle of operation is based on measuring the electrical resistance of the liquid between two immersion sensors and a reference terminal. If the measured value is lower than the sensitivity set at the front, the output relay changes its switching state. In order to exclude electrolytic phenomena in the liquid, the sensors are supplied with alternating current.

Two-level control: the output relay changes its switching state as soon as the liquid level reaches the maximum sensor, while the minimum sensor is submerged. The relay returns to its original switching state as soon as the minimum sensor no longer has contact with the liquid.

For safe resetting, the supply voltage must be interrupted for at least 0.5 s (T3).

The delay times T1 and T2 of the output relay have not been included in the diagram in order to enhance clarity.

Note:

It is also possible to connect other resistance sensors to the Min and Max terminals in the range 5 ... 100 k�, e.g. photoresistors, temperature sensors, encoders based on resistance etc. The monitoring relay can therefore also be used for other applications apart from monitoring the levels of liquids.

NSB0_00961A1/A2

T3

1

2

4

5

3

12

3

4

5

1

1

1

) Determined by the arrangement of the probes in the monitored liquid.

Maximum level )Minimum level )Monitored levelOutput relayFunction OVEROutput relayFunction UNDER

© Siemens AG 2007

7Monitoring Relays


Level monitoring

7/84 Siemens LV 1 T · 2007


1) Short-circuits without any relay contact welding according to DIN VDE 0660 Part 200.

1) The sensor cable does not necessarily have to be shielded, but it is not recommended to lay this cable parallel to the power supply lines. It is also possible to use a shielded cable, whereby the shield has to be connected to the M terminal.

Level monitoring sensors

Type 3UG30/3UG35

Load capacity of the output relay

Rated operational current Ie A Max. 8AC-15/24 ... 400 V A 3DC-13/24 V A 1DC-13/125 V A 0.2DC-13/250 V A 0.1

Minimum contact load mA 5 /17 V for a fault of 1 ppm

Output relay with DIAZED fuse1) gL/gG operational class A 4

Electrical endurance Operating cycles 1 x 105

Mechanical endurance Operating cycles 2 x 106

Ambient temperature During operation °C -20 ... + 50During storage °C -30 ... + 70

Conductor connection Solid mm² 2 x (0.5 ...2.5)Finely stranded, with end sleeves mm² 2 x (0.5 ...1.5)

Degree of protection Terminals IP20Enclosures IP40

Vibration resistance According to IEC 60068-2-6 Hz/mm 10 ...150/0.035

Rated control supply voltage Us V See Catalog LV 1, Selection data (electrical isolation by means of a transformer)

Voltage tolerance 0.85 ...1.1 x Us

Maximum power consumption W/VA 3 / 6

Function Inlet or outlet monitoring UNDER/OVER selector switch at the front

Sensitivity Adjustable k� 5 ... 100

Setting accuracy At maximum sensitivity % �30

Repeat accuracy At constant parameters % � 0.1

Sensor length Max. m 100

Electrode voltage Max. V 24 (50/60 Hz)

Electrode current Max. mA 1 (50/60 Hz)

Conductor capacity Of the sensor cable1) nF 10

Delay time• T1 at Max/M terminal ms Typically 500 (ON-delay with OVER, OFF-delay with UNDER)• T2 at MIN/M terminal ms Typically 300 (OFF-delay with OVER, ON-delay with UNDER)

Mains buffering time ms 300

Type 3UG32 07-3Athree-pole

3UG32 07-2Atwo-pole

3UG32 07-2Btwo-pole

3UG32 07-1Bsingle-pole

3UG32 07-1Csingle-pole

Length mm 500 500 -- -- --

Insulation (PTFE) Yes Yes Yes -- Yes

Installation Vertical Vertical Lateral Lateral Lateral

Screw-in gland width A/F 22

Thread Inch R 3/8

Connection cable mm2 3 x 0.5, 2 m long

Operating temperature °C 90

Operating pressure bar 10

Assignment

• Cable/Electrode Cable brown Center electrode

Not assignable

Gland Gland Gland

Cable white Not assignable

Not assignable

Not assignable

Electrode Electrode

Cable green Not assignable

-- Not assignable

-- --

© Siemens AG 2007

Monitoring Relays


7


Level monitoring


3UG35 01

Level monitoring sensors

3UG32 07-3Athree-pole wire electrode

3UG32 07-2Atwo-pole wire electrode

3UG32 07-2Btwo-pole bow electrode

3UG32 07-1Bsingle-pole bow electrode

3UG32 07-1Csingle-pole electrode, rugged version

■ Schematics

3UG35 01

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© Siemens AG 2007

7Monitoring Relays


Speed monitoring

7/86 Siemens LV 1 T · 2007

■ Overview

The 3UG30 51 monitoring relay is used together with a sensor to monitor operating mechanisms for underspeeding.

■ Function

The underspeed monitoring relay operates according to the principle of retriggerable OFF-delay. During the time (value) set on the front side, another pulse must arrive at input IN1 or IN2 to ensure that the output relay remains picked up. The monitoring relay evaluates the rising edge of the signal, i.e. a continuous signal is also recognized as a missing pulse. If the retrigger pulse does not arrive, indicating a reduction in speed, the output relay drops. In order to be able to start an operating mechanism, the output relay remains picked up during the ON-delay time T, even if the speed is still below the set value (motor starting override time). The first pulse must come within this time.

The monitoring relay can be used for all functions where a continuous pulse signal needs to be monitored (belt travel monitoring, completeness monitoring, passing monitoring, clock-time monitoring).

Speed monitoring without memory (NO MEMORY)

When the speed of the operating mechanism drops below the set value, the output relay drops. It picks up again when the speed is greater than the set value plus the fixed hysteresis.

Speed monitoring with memory (MEMORY)

When the output relay drops, this state remains stored even when the speed reaches a permissible value again. The stored state can be ended by a control signal at the reset terminal or by interrupting the supply voltage for at least 200 ms.

NSB0_00965A1/A2

T

12

4

3

12

3

4

Set valueHysteresisActual valueOutput relay

NSB0_00966A1/A2

TT

521

4

3

6 6

12

3

4

6

5

Set valueHysteresisActual valueOutput relayResetStorage (MEMORY)

© Siemens AG 2007

Documents

AG Monitoring Relays 3UG Monitoring Relays for … Relays Siemens LV 1 T · 2007 7/61 7 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring Overview Solid-state